Finally found proof that the HAMLIN family I'd been following around census records in Wisconsin was indeed the family of one of my FAIRBAIRN's. I'd not yet traced all of David and Jane (HERD) FAIRBAIRN's children and grandchildren. Their daughter Mary married a Walter LILLY and it is their dtr Jane I've been tracing and eventually found proof that the Jane F HAMLIN of an age to be her, was indeed nee LILLY. Many thanks to the kind person who transcribed the 1924 biography of her son James Harvey HAMLIN which appeared in a "History of Lincoln, Oneida, and Vilas Counties, Wisconsin", published in 1924.
I've not yet finished with the available records, but have updated the FAIRBAIRN descendant chart to show where I've got to on the newly included family. Added surnames include: HAMLIN, WENZEL, TARR, CLINE, and LEESE, so far; places Wisconsin (Lincoln Co, Oneida Co, Vilas Co) and Washington (Douglas Co, Chelan Co). As yet, I've not noticed anyone else researching this family.